Pulp board and process of manufacturing the same



Patented Dec. 25, 1928.

PATENT oFrlc UNITED STATES nnannnr 'rnnononn pares, or mmwoon, SYDNEY,NEW sour]: wms, husrnnu.

PULP BOARD. AND rnoonss or nnnnraornamo THE sum.

H0 Drawing. Application filed April 13, 1927, Serial No. 183,626, and inAustralia June 14, 1926.

valuable properties as a pulp for board making, and is applied to thatpurpose with success. Board, however, made from megass alone is ratherbrittle when rolled into thin sheets, and thickness increases the costand weight, and such sheets are more difiicult to dry.

The object of my invention is to provide an improved pulp board in whichmegass is a largely constituent part, and which will be tougher andlighter, and capable of thin rolling or pressin at the same time havinga fine surface. y invention also provides a process of manufacturing theimproved pulp board.

A pulp board made according to this invention consists essentially ofmegass and titree or bark of the ti-tree or both commonly found onswampy land. I have found that the addition of ti-tree or bark eifects amore ra id drying of the finished board.

y process consists in first soaking the megass in a solution of causticsoda to soften and clean it. After soaking, the megass is mixed withfinely ground ti-tree and/ or bark of the ti-tree.

I have found that good results are obtained by a mixture of eighty percent by weight of the megass and twenty per cent of the ti-trce barkalthough other proportions give satisfactory results.

After the mixing, the pulp is of good consistency and is taken away byconveyors to be boiled in a solutionof caustic soda or lime. Thisboiling is under steam and takes one to two'hours.

After cooking, the pulp is conveyed on a woven wire belt, and above thisbelt is another woven wire belt adapted to be lowered on to The board isfinished ofi the usual board forming manner and is useful for numerouspurposes.

I claim i 1. An improved pulp board comprising finely ground ti-tree.

2. An improved pulp board comprising finely ground ti-tree bark.

3. An improved pul board comprising finely ground ti-tree an ti-treebark.

4:. An improved pulp board comprising megass; and finely ground ti-tree.

5. An improved pulp board comprising megass; and finely ground ti-treebark.

6. An improved pulp board comprising megass; and finely ground ti-treeand ti-tree bark.

7. An improved pulp board comprising approximately 80 per cent of megassand twenty per cent of finely ground ti-tree.

8. An improved pulp board comprising approximately 80 per cent of megassand twenty per cent of finely ground ti-tree bark.

9. An improved pulp board comprising approximately 80 per cent of megassand twenty per cent of finely ground ti-tree and ti-tree bark.

10. In a method of manufacturing pulpboard comprising the steps ofsoaking megass in a caustic soda solution, mixing the megass withti-tree, grinding the megass and ti-tree, and boiling the mixed megassand ti-tree in a caustic soda solution.

11. In a method of manufacturing pulp board comprising the steps ofsoaking megass in a caustic soda solution, mixing the megass withti-tree, grinding the megass and ti-tree, and boiling the mixed megassand ti-tree in a lime solution.

12. In a method of manufacturing pulp board comp-rising the steps ofsoaking megass in a caustic soda solution, mixing the megass withti-tree bark, grinding the megass and titree bark, and boiling the mixedmegass and ti-tree bark in a caustic soda solution.

13. In a method of manufacturing pulp board comprising the steps ofsoaking megass in a caustic soda solution, mixing the megass withti-tree and ti-tree bark, grinding the megass and ti-tree and ti-treebark, and boiling the mixed megass and ti-tree and ti-tree bark in acaustic soda solution.

14. In a method of manufacturing pulp board comprising the steps ofsoaking megass in a weak solution of caustic soda, mixing apmentof thesubstances in the proximately 80 percent of the megass with 20 percentof ground ti-tree, grinding the megass and tie-tree, and boiling theground megass and ti-tree in a weak caustic soda solution for severalhours.

15. In a method of manufacturing pulp board comprising the steps ofsoaking megass in a weak solution of caustic soda, mixing approximately80 percent of the megass with 20 percent of ground ti-tree bark,grinding the megass and ti tree bark, and boiling the ground megass andti-tree bark in a weak caustic soda solution for several hours.

16. In a method of manufacturing pulp board comprising the steps ofsoaking megass in a weak solution of caustic soda, mixing approximately80 percent of the megass with 20 percent of ground ti-tree and ti-treebark, grinding the megass and ti-tree and titree bark, and boiling theground megass and ti-tree and ti-tree bark in a weak caustic sodasolution for several hours.

17. In a method of manufacturing pulp board comprising in conveying thepulp to the presses between parallel woven wire belts, and rapidlymoving the belts in intermittent to an ro motions in opposite directionsto eachother and moving one belt away from and toward the other belt toprovide a read justment of the substances in the pulp.

18. In a method of manufacturing pulp board comprising in conveying thepulp between parallel wire belts, and rapidly moving the belts inintermittent to and fro motions in opposite directions to each other andmoving the upper belt rapidly away from and toward the lower belt toprovide1 a readjust- 19. In a method of manu iac uring pulp boardcomprising in conveying the pulp between two parallel foraminiferousbelts, and moving the belts in intermittent to and fro motions inopposite directions to each other and at the same time moving the upperbelt rapidly away from and toward the lower belt to work the long andcoarse fibres of the pulp to the bottom and the fine fibres to the topand the intermediate fibres in regular graduation therebetween.

20. In a method of manufacturing pulp board comprising in arranging thefibres of the pulp so that the long and coarse fibres will be at thebottom and the fine fibres at the top, and the intermediate fibres inregular graduation therebetween.

21. In a method of manufacturing pulp board comprising conveying thepulp between two parallel foraminiferous belts moving in short and rapidreciprocating motions in opposite directions to each other and also oneelt rapidly up and down relative to the other belt to arrange the fibresof the pulp.

22. In a method of manufacturing pulp board comprising conveying thepulp between two parallel foraminiferous belts moving in short and'rapidreciprocating motions in opposite directions to each other and the upperbelt having a short up and down motion relative to the lower belt toarrange thefibres of the ulp.

23. In a method of manufacturing pulp board comprising conveying thepulp between two parallel foraminiferous belts the upper of which has ashort rapid up and down motion relative to the lower belt to arrange thefibres of the pulp. v

In testimony whereof I have affixed my signature.

HERBERT THEODORE PRICE.

